Android中为图标加上数字--用于未读短信数提醒

package com.flysnow.icon.notification; import android.app.Activity; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager.NameNotFoundException; import android.content.res.Resources; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.Typeface; import android.graphics.Bitmap.Config; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.provider.ContactsContract; import android.util.Log; import android.widget.ImageView; import android.widget.RemoteViews; public class NotificationIconActivity extends Activity { private final static String TAG="NotifacationIconActivity"; private final static int NOTIFICATION_CONTACT_ID=1; private ImageView mImageView; private NotificationManager nm; //处理过的加上联系人数量的图标 private Bitmap contactCountIcon; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mImageView=(ImageView)findViewById(R.id.icon); //优先采用联系人的图标，如果不存在则采用该应用的图标 Drawable contactIcon; try { contactIcon = getPackageManager().getApplicationIcon("com.android.contacts"); } catch (NameNotFoundException e) { contactIcon=null; } Bitmap icon; if(contactIcon instanceof BitmapDrawable){ icon=((BitmapDrawable)contactIcon).getBitmap(); }else{ icon=getResIcon(getResources(), R.id.icon); } contactCountIcon=generatorContactCountIcon(icon); mImageView.setImageBitmap(contactCountIcon); nm=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE); showNotifacation(contactCountIcon); } @Override protected void onDestroy() { super.onDestroy(); nm.cancel(NOTIFICATION_CONTACT_ID); } /** * 根据id获取一个图片 * @param res * @param resId * @return */ private Bitmap getResIcon(Resources res,int resId){ Drawable icon=res.getDrawable(resId); if(icon instanceof BitmapDrawable){ BitmapDrawable bd=(BitmapDrawable)icon; return bd.getBitmap(); }else{ return null; } } /** * 在给定的图片的右上角加上联系人数量。数量用红色表示 * @param icon 给定的图片 * @return 带联系人数量的图片 */ private Bitmap generatorContactCountIcon(Bitmap icon){ //初始化画布 int iconSize=(int)getResources().getDimension(android.R.dimen.app_icon_size); Log.d(TAG, "the icon size is "+iconSize); Bitmap contactIcon=Bitmap.createBitmap(iconSize, iconSize, Config.ARGB_8888); Canvas canvas=new Canvas(contactIcon); //拷贝图片 Paint iconPaint=new Paint(); iconPaint.setDither(true);//防抖动 iconPaint.setFilterBitmap(true);//用来对Bitmap进行滤波处理，这样，当你选择Drawable时，会有抗锯齿的效果 Rect src=new Rect(0, 0, icon.getWidth(), icon.getHeight()); Rect dst=new Rect(0, 0, iconSize, iconSize); canvas.drawBitmap(icon, src, dst, iconPaint); //在图片上创建一个覆盖的联系人个数 int contacyCount=getContactCount(); //启用抗锯齿和使用设备的文本字距 Paint countPaint=new Paint(Paint.ANTI_ALIAS_FLAG|Paint.DEV_KERN_TEXT_FLAG); countPaint.setColor(Color.RED); countPaint.setTextSize(20f); countPaint.setTypeface(Typeface.DEFAULT_BOLD); canvas.drawText(String.valueOf(contacyCount), iconSize-18, 25, countPaint); return contactIcon; } /** * 获取联系人的个数 * @return 手里通讯录中联系人的个数 */ private int getContactCount(){ Cursor c=getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, new String[]{ContactsContract.Contacts._COUNT}, null, null, null); try{ c.moveToFirst(); return c.getInt(0); }catch(Exception e){ return 0; }finally{ c.close(); } } /** * 显示状态栏通知 * @param icon 通知内容图标 */ private void showNotifacation(Bitmap icon){ Notification notification=new Notification(R.drawable.icon,"联系人数量",System.currentTimeMillis()); //使用RemoteView自定义通知视图 RemoteViews contentView=new RemoteViews(getPackageName(), R.layout.notification); contentView.setImageViewBitmap(R.id.image, icon); contentView.setTextViewText(R.id.text, "图标上的红色数字表示手机中联系人的数量"); notification.contentView=contentView; Intent notificationIntent=new Intent(this, NotificationIconActivity.class); PendingIntent contentIntent=PendingIntent.getActivity(this, 0, notificationIntent, 0); notification.contentIntent=contentIntent; nm.notify(NOTIFICATION_CONTACT_ID, notification); } }